package com.sky.dish.aspect;

import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.dish.annotation.AutoFill;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 定义切入点；
     */
    @Pointcut("execution(* com.sky.dish.service.*.*(..)) && @annotation(com.sky.dish.annotation.AutoFill)")
    public void autoFillPointcut(){}
    /**
     * 定义前置通知：为公共字段进行赋值
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("公共字段自动填充...");
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType value = annotation.value();//获取数据库操作类型

        //获取当前被拦截的方法参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args==null || args.length==0){
            return;
        }

        Object entity = args[0];

        //准备赋值的数据；
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，对应的属性通过反射来赋值

        switch (value){
            case INSERT:
                try {
                    Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                    Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    //为对象赋值
                    setCreateTime.invoke(entity,now);
                    setCreateUser.invoke(entity,currentId);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            case UPDATE:
                try {
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
                default:
                    System.out.println("类型错误！！");

        }

    }
}
